Re: Performance Issues on Opteron Dual Core

Jim,

Have you seen this happening only on W2k3? I am wondering if I should try
out 2000 Pro or XP Pro.
Not my first choice, but if it works...

-----Original Message-----
From: Jim C. Nasby [mailto:jnasby(at)pervasive(dot)com]
Sent: Tuesday, May 02, 2006 3:29 PM
To: Mark Kirkwood
Cc: Gregory Stewart; pgsql-performance(at)postgresql(dot)org
Subject: Re: [PERFORM] Performance Issues on Opteron Dual Core

On Sun, Apr 30, 2006 at 10:59:56PM +1200, Mark Kirkwood wrote:
> Pgadmin can give misleading times for queries that return large result
> sets over a network, due to:
>
> 1/ It takes time to format the (large) result set for display.
> 2/ It has to count the time spent waiting for the (large) result set to
> travel across the network.
>
> You aren't running Pgadmin off the dev server are you? If not check your
> network link to dev and prod - is one faster than the other? (etc).
>
> To eliminate Pgadmin and the network as factors try wrapping your query
> in a 'SELECT count(*) FROM (your query here) AS a', and see if it
> changes anything!

FWIW, I've found problems running PostgreSQL on Windows in a multi-CPU
environment on w2k3. It runs fine for some period, and then CPU and
throughput drop to zero. So far I've been unable to track down any more
information than that, other than the fact that I haven't been able to
reproduce this on any single-CPU machines.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461

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